01 -
Carefully slice slider rolls horizontally without separating the halves. Place cut side up on a 9x13-inch sheet pan and toast under the broiler for 2 to 4 minutes until golden brown. Remove and set aside.
02 -
Lower oven temperature to 350°F (175°C). Lightly grease a 9x13-inch casserole dish with non-stick cooking spray. Arrange toasted roll bottoms in the dish.
03 -
Combine yellow mustard and mayonnaise in a small bowl. Spread half of this mixture evenly over the bottom halves of the rolls.
04 -
Place halved Swiss cheese slices over the mustard spread, overlapping as needed. Layer the ham slices folded for fit, then add pulled pork evenly. Top with a single layer of dill pickle slices, followed by the remaining Swiss cheese slices. Press gently to even the layers.
05 -
Bake the assembled layers uncovered at 350°F (175°C) for 5 minutes.
06 -
Spread remaining mustard mixture on the cut side of the roll tops. Place toasted tops onto the layered bottom halves. Brush tops with melted butter and sprinkle generously with poppy seeds.
07 -
Cover the casserole with foil and bake until cheese melts and filling is heated through, about 20 minutes. Remove foil and bake an additional 5 to 8 minutes until tops are golden brown.
08 -
Serve sliders warm, individually portioned.